Sometimes yes. Even though you may know you didn’t do anything wrong, people who do not know you will be investigating and judging you. It can be good to have someone doing the talking for you to minimize miscommunication and not unintentionally making a situation worse.
Police officers are not required to tell the truth when they are investigating things. There have been many instances of people falsely admitting things because the pressure they felt under expert questioning.
Bill is often hired as a just in case option for on-going investigations to give advice and knowing how to talk with law enforcement and governmental agencies.
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